The Definitive Guide to Data Quality
1. How can I know what the functions do? (count, min,
max, avg, sum, first, last, list, list(objects),
count(distinct), standard deviation).
2. In the manual, in 'Input Column Position', he puts 'Points' without show what it means.
3. Finally, in the manual, he didn't show the types that should been chosen (String,int,float,...)